TY - JOUR
T1 - Nanosized magnetite particles in urban road dust
T2 - distribution characteristics and their potential risk
AU - Niu, Zuoshun
AU - Cai, Qiuyu
AU - Xu, Miao
AU - Peng, Bo
AU - Wang, Mengyuan
AU - Shi, Zhiqiang
AU - Yang, Yi
N1 - Publisher Copyright:
© 2025 The Royal Society of Chemistry.
PY - 2025/10/9
Y1 - 2025/10/9
N2 - Urban road dust acts as a significant reservoir for nanosized magnetite particles (NMPs), which pose health risks through atmospheric resuspension. This study systematically investigated the characteristics of NMPs in Shanghai's road dust, using a cycle magnetic extraction system to isolate NMPs from bulk dust samples. Transmission electron microscopy (TEM) analyses revealed the aggregation of NMPs and Pd-nanoparticles, indicative of vehicular emissions. Number concentrations of NMPs in road dust were 1.4 × 104-9.5 × 106 particles per mg, with an average size of 102 nm. Seasonally, the number concentrations of NMPs in summer were 2.24-fold higher than in winter, which could be attributed to the enhanced wet deposition from PM2.5 during rainy periods. Spatially, industrial and traffic areas exhibited NMP number concentrations averagely 2.1 times higher than other functional areas, accompanied by elevated mass fractions of toxic metals (including V, Mn, As, Ag, Sn, Sb, Tl, and Pb) in NMPs. The industrial land area was identified as the primary spatial determinant of NMP distribution, and the larger the industrial land area, the higher the number concentration of NMPs in road dust. Notably, traffic and commercial areas showed heightened exposure risks due to the combined effects of elevated NMP concentration and dense human activity. These findings highlight the necessity for targeted pollution control strategies in mega-cities, particularly addressing vehicular and industrial emission sources.
AB - Urban road dust acts as a significant reservoir for nanosized magnetite particles (NMPs), which pose health risks through atmospheric resuspension. This study systematically investigated the characteristics of NMPs in Shanghai's road dust, using a cycle magnetic extraction system to isolate NMPs from bulk dust samples. Transmission electron microscopy (TEM) analyses revealed the aggregation of NMPs and Pd-nanoparticles, indicative of vehicular emissions. Number concentrations of NMPs in road dust were 1.4 × 104-9.5 × 106 particles per mg, with an average size of 102 nm. Seasonally, the number concentrations of NMPs in summer were 2.24-fold higher than in winter, which could be attributed to the enhanced wet deposition from PM2.5 during rainy periods. Spatially, industrial and traffic areas exhibited NMP number concentrations averagely 2.1 times higher than other functional areas, accompanied by elevated mass fractions of toxic metals (including V, Mn, As, Ag, Sn, Sb, Tl, and Pb) in NMPs. The industrial land area was identified as the primary spatial determinant of NMP distribution, and the larger the industrial land area, the higher the number concentration of NMPs in road dust. Notably, traffic and commercial areas showed heightened exposure risks due to the combined effects of elevated NMP concentration and dense human activity. These findings highlight the necessity for targeted pollution control strategies in mega-cities, particularly addressing vehicular and industrial emission sources.
UR - https://www.scopus.com/pages/publications/105018065981
U2 - 10.1039/d4en01036a
DO - 10.1039/d4en01036a
M3 - 文章
AN - SCOPUS:105018065981
SN - 2051-8153
VL - 12
SP - 4592
EP - 4602
JO - Environmental Science: Nano
JF - Environmental Science: Nano
IS - 10
ER -
